Question about 2004 Harley Davidson FXDWG - FXDWGI Dyna Wide Glide

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There is a nipple on the back side of my carb and i cant seem to find where the other end of the hose hooks too?

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The hose goes to the VOES (vacuum operated electric switch) and the petcock if you have a carburated engine. The purpose of the VOES is to ****** the timing on your engine. Let me explain.

When you're cruising down the road with no heavy load, the electronic ignition unit will allow the ignition timing to go above 35° total. It does this to get higher fuel economy and lower emissions. When cruising, the throttle is not very wide open and the manifold vacuum is high.

But, the moment you accelerate, you open the throttle wider and the manifold vacuum drops. When this happens, the VOES changes state. causing the electronic ignition to ****** the timing back to where it should be. The reason you want to ****** the timing when accelerating is to prevent spark knock or pinging.

So, some will say that the VOES advances the timing when the vacuum is high. Others will say it retards the timing when the vacuum goes low. You choose what you think it does.

Posted on Sep 25, 2009

Testimonial: "thanks for the information! my bike is fuel injected so im assuming it gets a rubber cap on it... thank you so much for your input it was helpful"

  • wd4ity
    wd4ity Sep 27, 2009

    Don't just cap the nipple off without checking to see if the bike is equipped with a VOES. The latest schematic that I have is 2000 year model. Check with your local dealer to see if the bike indeed has this switch. If so, make sure it is connected to the manifold vacuum in some manner. If you bike starts to "spark knock" or "ping" upon acceleration, the VOES is not working as it should. Good Luck.

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